Question: What is the funicular with the lowest average gradient whose source of energy is electricity?
Paraphrase: which is the funicular with the lowest average gradient whose source of energy is electricity?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q142031 . ?ent wdt:P2198 ?obj . ?ent wdt:P618 wd:Q12725} ORDER BY ASC(?obj)LIMIT 5 
Answer: Ebbw Vale Garden Festival Funicular